Very fun game! I honestly love how it feels to play, it's so satisfying.
One little thing, I'm the kind of person that likes to test how spamming stuff is handled in games. And well, in your case, it might just sliiiightly overpowered hahaha. Maybe adding something like a bullet count would help with that?
Other than that, it is very solid, I had a blast! Interesting window sizing as well. As someone already stated, it had that "doodle jump" feel, that was very nice.
Great entry, and congratulations for your first jam! 🔥